US2306073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric control of heating equipment
Assignee: PHOTOSWITCH Inc
•
Filing: 1939-12-08
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Granted: 1942-12-22
•
Expires: 1959-12-08
Abstract
No abstract record available.
Inventors
- 👤 Arthur G B Metcalf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:12
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/27; G05D23/1927; G05D23/1928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-12-21 | 1946-06-22 | 1946-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-12-21 | 1950-06-22 | 1950-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-12-21 | 1954-06-22 | 1954-12-22 | $7700.00 | Window Closed / Lapsed |